To calculate the radiative heat transfer between fuel bundle surfaces and from the surfaces to the vapor and droplets in a boiling water reactor, it is necessary to calculate the geometrical fuel factors. These view factors, which are the fraction of energy leaving one surface that reaches a second surface when no fluid exists, must be calculated for every pair of fuel rods, from every rod to every channel segment, and from one channel segment to a second channel segment. The crossed-string method was used to obtain algebraic equations for the view factors between rods of the same diameter, from rods-to-channel segments, and from one channel segment to a second channel segment. These equations can be easily incorporated into computer codes. Conservation of energy was used to verify the view factor equations.